From a smart phone, however, again without logging in to Google, if you try to go directly to the same "Posts" page (https://plus.google.com/107770072576338242009/posts), you are redirected to m.google.com where you see a link to "Posts", but if you click it, you are asked to sign in with your Google account. This is odd to me. The posts are public; they should be anonymously viewable from a smart phone just like they are from a laptop.

5 Answers
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A workaround for anonymous smart phone users to view Google+ "Posts" pages without logging in is to first navigate to the user's "Photos" page, such as this one, and then click the user's name (i.e. "Philip Durbin") to get their "Posts" page.

This is by design as Google wants everyone to have an account to access even though the access circle is set as public. To our knowledge there is no work around for mobile access without login validation.

http://www.pluss.es is a good way to expose your public Google+ posts to mobile users without requiring them to sign in to Google. As of this writing, it's free to have Plusses crawl your posts and expose them as a blog.

If I go to my Google+ page on a smartphone now with a browser that isn't logged in to Google, I can see posts all my posts, which is just great.

My only quibble is that after browsing to a particular post, the URL is pretty long and crazy, much longer than I would see on the desktop side. But at least you can share it and it seems to work (though it's a mobile view). It looks like this...